Rotary compressor.



K. AHLQUlsT. ROTARY COMPRESSOR.

APPLICATION FILED MAY 17I 1910.

1,080,743, Patented Dec. 9, 1913.

.' t'. .l I i KARL AHLQUIST, 0F RUGBY, ENGLAND, .ASSIGOR T0 GENERAL ELECTRIC COMPANY, .A CORPORATION 0F NEW YORK.

ROTARY y COMPRESSOR.

Application filed May 17, 1910.

To all 'who-m t may concern:

Be it known that I, KARL AHLQUls'r, a

subject of the King of Sweden, residing at' necessary to cool the air, or other elastic fluid being treated,l during the process of compression. This was generally done while the air was passing from one stage to the next and, to effectively cool it, it has sometimes been found necessary tov carry the air outside of the compressor casing between the successive stages and to pass it through separate coolers in order to avoid the necessity of increasing the size of the compressor unduly.

Thelobject of this invention is to provide a` compressor of the above type which will have a high eiciency without increasing the size of the apparatus to any greatextent, and to this end it consists in providing large radiating surfaces in the path of the fluid from one stage of the compressor to the next, said surfaces being provided with means for conducting away the heat taken from the fluid. i

In the accompanying drawings which illustrate my invention, Figure 1 is a sectional side view of a portion of a compressor,

lFig. 2 is a cross-sectional elevation on the line 2 2 of Fig. l and Fig. 3 is a developed section on the line 3-3 of Fig. 1.

In the drawings, l represents the impeller hubs carrying the moving blades 2. The air or other elastic fluid is discharged from the blades through fixed guide vanes 3 which partially convert the velocity of the fluid into pressure. After passing through these vanes the fluid is caused to pass be.- tween a number of ribs or webs 4: which project radially inward from the casing. These ribs are arranged on the inside of the casing on the principle of a screw-thread as clearly shown in Fig. 3 sothat the iiuid which issues from the vanes 3 at a. considerable tangentialvelocity is screwed axially Specification of Letters Patent.

Patented Dec. 9, 1913.

Serial No. 561,813.

relatively to the casing until it comes opposite the passage 5 in the diaphragm. ar-

range-dbetween the stages, said passage leading to'the next stage of the compressor. The ribs 4 are kept cool by surrounding the casing with a passage 6 through which water is circulated.

A compressor constructed as above de-y scribed provides a large cooling surface for the air without greatly increasing the size of the compressor casing and the cooling is very effective owing to the high speed at wneh the. air is caused to pass between the r1 s.

tangential velocity-of the fluid at the exit of the discharge vanes in any case will be toa large extent lost in friction and eddy currents before entering the next stage5 The necessity of employing a separate cooling device is also obviated by this construction.

In accordance with the provisions of the frpatent statutes, l have described `the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof; but 'I desire to have it understood that the apparatus shown is only illustrative', and that the invention can be carried out by other means.

What l claim as new and desire to secure by Le-tters Patent of the United States, is 2- 1. A rotarycompressor comprising a casing provided with a plurality of stages and an impeller for each stage, there being iiuid conducting passages'between the stages that 'are arranged within the casing and other passages within the casing for circulating a cooling medium, said cooling passages being provided with radiating members that project into the conducting passages.

2. A multi-stage rotary compressor comprising impellers, a casing therefor containing passages for conducting Huid from one stage to the next, and means alseeflocaited within t-he casing for circulating` a/"cooling f No material loss in pressure due 'to' passage frictlon .takes place as the residual 4. multi-stage rotary air-compressor, having a casing containing helically arranged ribs forming passages for conducting the air from one stage to the neXt.

5. A multi-stage rotary airscompressor,

having a casing containing helically arranged,

ribs forming passages for conducting the air from one stage to the next, and a water jacket surrounding said air passages.

6. A rotary compressor comprising a casing divided into stages by diaphragms having passages through which the fluid Hows from one stage to another, an impeller for eachy stage, and helical passages formed kin vthe outer portion of the casing which receive the discharge from the impellers and direct it forwardly into the passages in the diaphragme.

7. A rotary compressor or'nprisingl a .casing divided into stages by diaphragms having passages` through which the fluid flows from one stage to'another,- an mpeller for each stage, a plurality of VVparallel helical passages formed in the outer portion of vthe casing which receive the discharge from the impeller and direct it forwardly into the' passages in the adjacent diaphragm, and means for cooling *the walls o the passages.

In Witness whereof, I have hereunto set my hand this seventh day of April, 1910.

KARL AHLQUI ST. 

